Not sure it would prevent these kind of issues, wouldn't it be possible to create a new spam account using a different e-mail address? Unfortunately, if someone is determined to spam, I think it's hard to prevent.
Maybe the best way would be to give admin access to a couple of trusted and regular users, so they can delete / rename stories if required?
In my personal experience, OAuth decreased about 40% to 60% percent of spam in my projects.
But I think you are right. More admins/moderators should be enough at this time; the community is still growing. I’d like to nominate @bevacqua and @pid.
Forgot to answer this one, thanks for the suggestion I will definitely keep the suggestions in mind. And you should probably be on the nominates list too :-)